3Tvwo Ch 8/10 Test yourself or Extra exercises

• Wiskunde
• Middelbare school
• vwo
• Leerjaar 3

Today's content:

Ch8 or Ch10:

+ Test yourself: choose 4 exercises

+ Test yourself: choose 5 exercises

Math B pupils,

Yesterday you followed a long explanation about exercise 38.

Today I just leave you to it, to do your Homework, so do:

p.118/119     4 exercises from Test Yourself, or

p.120/121    5 exercises from Extra exercises,

right now. Of course feel free to follow the coming slides too!

Math A boys and girls,

Before you start doing the Homework, 

let's go through (a part of) exercise 38 first.

It is a typical MATH A task and contains a few 

tricky points!

How?!

+ open your Textbook on p.31 and your

+ you'll need your calculator too!

+ Notebook, to work out a, b, c and d together

+ of course, if you have done so, already,

    just follow the slides, comparing to your own results. 

+ first you see the whole exercise; than part by part

+ several M.C. will follow; don't fool yourself and key in your own answer!

Even if you'd hardly score a point,

by participating and really trying,

            you'll learn a lot!

esp. because a slide with an explanation of the answer follows,                  every time a question is answered!

Work out for yourself and key in in the next slide:

the MEDIAN.

Let's do this step by step:

1st key in the total number of cars.

Number of cars:

a. 249                       b. 251

c. 252                      d. 250 

Fill in, in next slide!         

Total number of cars: .....

1. 249
2. 251
3. 252
4. 250

2nd question:

Calculate the median!

The median is...

a. 125                           b. 126

c. 7                    d.  6

The median is: ..........

1. 125
2. 126
3. 7
4. 6

38a  explanation median:

3rd: calculate the lower and the upper quartiles!

Answers: next slide.

38a Quartiles:

a. 3 and 9                 b. 4 and 8

c. 4 and 9                 d. 3 and 8

Quartiles are:

1. 3 and 9
2. 4 and 8
3. 4 and 9
4. 3 and 8

38a explanation quartiles:

With all the information we have now,

draw the BOX PLOT ! (= 38b)

What information??! Well:

+      median = 6

+      Q1 = 4 

+      Q3 = 8     Have a good try. In the next slide you see the              

        desired result.

Desired result:

Time to key in the mode, 38c.

the mode is ....

a. 39            b. 35

c. 8               d. 7 

Key in, in the next slide!

The mode is: ....

1. 39
2. 35
3. 8
4. 7

Explanation 38c:

The MODE is the age class with the HIGHEST FREQUENCY.

So the MODE is 7 years, as 39 cars sold is clearly the

highest frequency.

One more to go: 38d:

The correct answer for 38d is ...

a. 65 %                                  b. 44 %

c. 56 %                                  d. 57 %

Key in, in next slide!

38d The % of cars that has an age less than the mode is .... %

1. 65 %
2. 44 %
3. 56 %
4. 57 %

possible explanation:

1st way:   (the Solutionsbook is fond of ratio tables!):

2nd way (that I'd prefer):

140/250 x 100 % = 56 %

No matter how succesful you've been...

or how tired you are now...

more important is  

+ your activity and you

+ having learned a lot about Statistics!

+ thanks for trying hard and for your presence.

Because this was a long task ...

you only have to choose:

4 exercises of Test yourself, p.36/37  or

5 exercises of Extra exercises, p.38/39

HOMEWORK TIME -  Bye for now!